<template>
  <div class="login-container">
    <el-form
      ref="loginFormEl"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">Login Form</h3>
      </div>

      <el-form-item prop="username">
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="Username"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter="handleLogin"
        />
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width: 100%; margin-bottom: 30px"
        @click.prevent="handleLogin"
        >Login</el-button
      >

      <div class="tips">
        <span style="margin-right: 20px">username: admin</span>
        <span> password: any</span>
      </div>
    </el-form>
  </div>
</template>

<script lang="ts" setup>
import { validUsername } from '@/utils/validate'
import type { FormInstance, FormRules } from 'element-plus'

interface LoginForm {
  username: string
  password: string
}
const loginForm = reactive<LoginForm>({
  username: 'admin',
  password: '123456'
})
const loginRules = reactive<FormRules<typeof loginForm>>({
  username: [{ required: true, trigger: 'blur', validator: validateUsername }],
  password: [{ required: true, trigger: 'blur', validator: validatePassword }]
})

const router = useRouter()
const loginFormEl = ref<FormInstance>()
const loading = ref<boolean>(false)
const passwordType = ref<string>('password')
const redirect = ref<string | undefined>(undefined)

function validateUsername(
  _rule: unknown, // 使用 unknown
  value: string,
  callback: (error?: string | Error) => void
) {
  if (!validUsername(value)) {
    callback(new Error('Please enter the correct user name'))
  } else {
    callback()
  }
}
function validatePassword(
  _rule: unknown, // 使用 unknown
  value: string,
  callback: (error?: string | Error) => void
) {
  if (value.length < 6) {
    callback(new Error('The password can not be less than 6 digits'))
  } else {
    callback()
  }
}

const handleLogin = () => {
  if (!loginFormEl.value) return false
  loginFormEl.value.validate((valid) => {
    if (valid) {
      loading.value = true
      router.push({ path: redirect.value || '/' })
      console.log('submit!')
    } else {
      console.log('error submit!')
      loading.value = false
    }
  })
}
</script>
<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
